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Another Newbie Question: Disc Brake Dust Cover... Necessary?

This is a discussion on Another Newbie Question: Disc Brake Dust Cover... Necessary? within the Technical forums, part of the Caferacer.net Forums category; Originally Posted by XB33BSA gto i respectfully disagree it isn't anything at all diust related and it isn't shielding the rotor from anything it is ...

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Thread: Another Newbie Question: Disc Brake Dust Cover... Necessary?

  1. #11
    Senior Member Geeto67's Avatar
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    Quote Originally Posted by XB33BSA View Post
    gto i respectfully disagree
    it isn't anything at all diust related and it isn't shielding the rotor from anything
    it is strictly anti water fling
    think about how ,much material a pad would need to sheid in order for it to be a ;roblem
    getting new pads in timre would be the issue
    brake dust takes time and many braking cycles to accunulate
    the shields on car rotors are mostly there to protrect the rotor from the rare bigger foreign object and gritty muddy road water that wil accelerate wear
    I don't clean my bikes usually, maybe once a season at best and just a wash and wax the painted surfaces. I'm not one of those guys that sits there with a tire on a roller and a toothbrush polishing spokes. I can tell you that the CB's I had without that guard always had a little build up of brake dust on the inside of the fork slider after about two seasons, but then again my riding environment at the time was NYC. I am sure some of that was road grime as well, but the bikes with it didn't have that buildup anywhere but in the shield. Then again this was also when cb's were just cheap 20+ year old motorcycles nobody wanted and my version of maintenance was to wait till something failed and then either replace it or buy another $100 honda that ran and transfer over the good parts so I could easily have been riding on crumbly 20+ year old brake pads. YMMV.

    I def agree about the spray part - after I had my wreck on my 75, I ran it without a front fender and without that guard, and I could see the rooster tails that came off the whole unfaired front (under 10mph, faster and it got harder to see through the spray) and let me tell you it made a mess of everything, esp if you run though one of those NYC puddles that is part water, part oil, part antifreeze, and part just gutter scum.
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  2. #12
    Senior Member TrialsRider's Avatar
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    you missed dog poo and road kill or is that gutter scum?

    ... bet my dirt bikes are on average way cleaner then Geeto's street bikes
    competition bikes have to be clean just to be competitive.
    Races have been won by staying cleaner then the other guy.
    Last edited by TrialsRider; 02-25-2019 at 10:06 AM.

  3. #13
    Senior Member seanbarney41's Avatar
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    gotta have it on a nice correct restoration...unfortunately, I don't have any of those, so I have a pretty big box of spares. The cb750f even had one on the rear disc so as to make sure you are not flinging water on anyone behind you lol. To be honest, I have been in the rain plenty on cb750's and never noticed if water from the disc/s was actually hitting me or not. The stock front fender certainly seems to work well.

    One thing I have noticed with well worn oem pads and undrilled discs...heavy rain, grab the handle, and wait for what seems like ages, while the bike feels as if it is accelerating!, until the rotor gets hot enough to keep the wet off the rotor

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  5. #14
    Junior Member OldZaskar's Avatar
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    Thanks the help on this guys. I cringed when I hit "post" on that question. As a total newbie to old (okay, any) motorcycles, I really don't know whether my questions are in the "hey, do I really need front brakes" category of stupid, or not.

    It sounds like - since this CB500 is not a pristine survivor headed for a museum restoration, and will likely not see any (intentional) wet weather - I can keep the "disc fender" in the bin of O.E. parts that have come off and will not go back on... but will be saved. By the way, the car/truck guy in me won't let me just chuck the old parts in a bin. As you may have noticed from that pic - everything that comes off, gets thoroughly cleaned, threads lightly greased, bagged and labeled with hardware.

    Next up: Chain guards
    (kidding)

  6. #15
    Senior Member crazypj's Avatar
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    Got to agree with XB. The brakes were absolutely F****** terrible when wet. It was meant to keep water off rotor but didn't really do much, water ran down fork leg from mudguard mount then got between fork leg and cover making things worse rather than better (although it did keep your left foot extra wet plus mess up alternator cover by directing a little water away from disc ) mine came off as soon as waranty was up (I did dual disc conversion at same time, 550 needed it, 750 was scary with single disc) I just realised I've had this conversation before with Geeto, probably 2009?
    Geeto67 likes this.
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